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There are products on the market to do what you propose. In fact I am considering purchasing such a system from my local Leica rep. A series of images are taken at different planes. Software then automatically deconvolutes the images seamlessly into a single one with infinite depth of field. The resultant images are quite striking. I work under a microscope but I suspect that the system could be adapted to any stable photo stand. Tim TomDeVrie@aol.com wrote: > Following the discussion of limitations in the depth of field of digital > cameras, I wondered: > > Can the photographer with a digital camera overcome this problem by taking > two pictures of the same object, but with slightly different distances to the > object (say, a 1 cm difference), and then blend the two images in Photoshop > to take advantage of the portions of each image that are best focused? > > I've started experimenting with this process and initial results are > encouraging for a uniformly curved gastropod about 3 cm long. Two pictures > were taken with distances to obect varying by one cm. Each image included a > portion in focus and out of focus. One of the two images was re-scaled to a > slightly larger size (e.g., 2048 to 2058 pixels) so that image dimensions > matched. An airbrush-eraser was used on two Photoshop layers, each layer > having one of the images. > > The final images need to be 'flattened' to create a single image. > > Fortunately, there seemed to be no seam between the airbrushing done on the > two components of the final image. Airbrushing the same area produces a > white patch, but the error can be caught when the airbrushing is first being > done and remedied with an "undo" command. > > It may be that a small degree of poor resolution near the boundaries of the > airbrushed areas is an acceptable price to pay for much better focus along > the entire vertical distance of the fossil. > > Are there others on the listserve who have experimented more extensively with > this approach? Are there parameters beyond which the technique does not work? > > Tom DeVries -- ___________________ Dr. R. Timothy Patterson Professor of Geology Department of Earth Sciences 2240 Herzberg Building College of Natural Sciences Carleton University Ottawa, Ontario K1S 5B6 CANADA ___________________ (613) 520-2600 ex 4425 Fortress of Solitude: (613) 228-0012 FAX: (613) 520-2569 tpatters@ccs.carleton.ca www.carleton.ca/~tpatters Personal Web Page http://www.carleton.ca/~tpatters NSERC Strategic Fisheries Initiative http://www.earthsci.carleton.ca/Museum/strategicfisheriesproject/ Hooper Virtual Natural History Museum http://www.earthsci.carleton.ca/Museum/hvpmdoor.html Climate Change: A Geological Perspective WWW Course http://www.carleton.ca/courses/67.242/ Message generated on a Apple Macintosh 450Mhz G4/System 9.04 This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use, distribute, or copy this message or attachment in any way. If you received this e-mail message in error, please delete the e-
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